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    <title>Document</title>
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    <script>
        function Star(uname,age){
            this.uname = uname ;
            this.age = age ;
            // this.sing = function(){
            //     console.log("我会唱歌");
            // }
        }
        Star.prototype.sing = function(){
            console.log("我会唱歌");
        }
        var ldh = new Star('刘德华',18);
        var zxy = new Star('张学友',18);
        console.log(Star.prototype);
        console.log(Star.prototype.__proto__ === Object.prototype);
        //我们Star原型对象里面的__proto__原型指向的是Object.protopyte
        console.log(Object.prototype.__proto__);
    </script>
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